Acquisition of EEG signals

Electroencephalogram (EEG) signals are the comprehensive manifestation of the electrophysiological activity of brain nerve tissue on the surface of the cerebral cortex. The methods for recording EEG signals include scalp electroencephalography (EEG) and cortical electroencephalography (ECoG). The amplitude of EEG signals gradually increases as the sampling location approaches the cerebral cortex.

The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.

EEG signals are formed by the sum of a large number of postsynaptic sites in the cortex, including excitatory salience potentials and inhibitory postsynaptic potentials, and are the result of the collective activity of many neurons. Electroencephalography records the electrical activity of the brain through electrodes, which are usually embedded in electrode caps. This electrode cap usually takes 5 minutes to install on the user and adjust the electrode to obtain a good signal. The electroencephalogram system is relatively inexpensive and portable, and is the most common neuroimaging method in BCI research.